Temperature controlled mixing valve-diaphragm type



June 13, 1950 c. R. susKA 2,511,792

TEMPERATURE CONTROLLED MIXING VALVE-DIAPHRAGM TYPE Filed Nov. 4, 1948 5 Sheets-Shget 1 swam tom 6 .1 2324 SZQ qrM Jfiiys.

June '13, 1950 c. R. susKA 2,511,792

TEMPERATURE CONTROLLED MIXING VALVE-DIAPHRAGM TYPE Filed Nov. 4, 1948 5 Sheets-Sheet 3 June 13, 1950 c R. SUSKA ,5 ,7

TEMPERATURE CDNTROLLED MIXING VALVE-DIAPHRAGM TYPE Filed Nov. 4, 1948 5 Sheets -Sheet 4 June 13, 1950 1 c. RVSUSKA, 2,511,792

' TEMPERATURE CONTROLLED MIXING VALVE-DIAPHRAGM TYPE Filed Nov. 4, 1948 5 Sheets-Sheet 5 7/7 3. 55A L, a 56" Will/I0 "l /ME? Patented June 13, 1950 TEMPERATURE CONTROLLED MIXING VALVE-DIAPHRAGM TYPE Charles R. Suska, Corry, Pa., assignor to Aero Supply Mfg. 00., Inc., Corry, Pa.

Application November 4, 1948, Serial No. 58,199

13 Claims. 1

This invention relates to a temperature controlled mixing valve of the diaphragm type.

An object of this invention is to provide a mixing valve wherein at least two fluids of different temperatures are adapted to be mixed together with the temperature of the mixed fluids controlled by means of thermostatic switches connected to the valve plug operator.

Another object of this invention is to provide a mixing valve including one or more quick acting thermostatic switches which are connected to a solenoid valve operator so that the temperature of the mixed fluids will be held to a predetermined minimum and maximum.

Another object of this invention is to provide in combination with a multi pole time switch, a mixing valve, an electric operator for the valve, thermostatic switches connected to the time switch and the electricoperator whereby a predetermined temperature of fluid passing through i the valve will be maintained for a selected time period, and a float operated switch adapted to cut oil current to the time switch and the thermostatic switches when a predetermined quantity of mixed fluids has been discharged into a receiver, such as a washing machine or the like.

Another object of this invention is to provide a modulated valve operation ina mixing valve so that tempered fluid may be discharged from the valve, the physical movement of the valve plug being effected by means of a solenoid connected to a series of thermostatic switches which are highly sensitive to temperature fluctuations.

A further object of this invention is to provide in a tempered mixing valve, a valve plug carried by a diaphragm wherein the diaphragm is held in closing position by pressure differential on opposite sides thereof, and is moved to open position by reduction of pressure on one side of the diaphragm.

A further object of this invention is to provide in a mixing valve of this type, means for balancing the valve plug when the latter is moved to open or mixing position.

A furtherobject of this invention is to provide in a mixing valve of this type, means for balancing the valve plug in any position thereof.

With the above and other objects in view, my invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification, and then more particularly pointed out in the appended claims.

In the drawings,

Figure 1 is a detail end elevation of a temperature controlled mixing valve constructed according to an embodiment of this invention,

Figure 2 is a detail side elevation of the valve,

Figure}; is a plan view of the valve,

Figure 4 is a sectional view taken substantially on the line 4-4 of Figure 2,

Figure 5 is a sectional view taken on the line 5--5 of Figure 2, t

Figure 6' is a fragmentary sectional view taken on the line 6--6 of Figure 2,

Figure 7 is a sectional view taken on the line of Figure 4,

Figure 8 is a vertical sectional view similar to Figure 4 of a modified form of this invention,

Figure 9 is a fragmentary side elevation, partly in section, of another modification of this invention,

Figure 10 is a sectional view taken on the line I0-l0 of Figure 9,

Figure 11 is a fragmentary vertical section of a further modification of this invention,

Figure 12 is a diagrammatic view showing the electric circuits embodied in this invention,

Figure 13 is a diagrammatic view of a modified form of electric circuit used with this invention,

Figure 14 is a fragmentary sectional view taken on the line I l-l4 of Figure 8.

Referring to the drawings and first to Figures 1 to 7 inclusive, the numeral 15 designates generally a valve housing which is formed with a pair of intake members l6 and I! for connection to fluid supply means. The intake member 16 is designed for communicating the interior of the valve housing IS with a source of cold fluid supply such as water or the like, whereas the intake member I! is adapted to be connected to a heated fluid supply such as hot water.

The intake members [6 and I1 are constructed in the form of laterally projecting nipples, and the housing [5 is formed with intake ports [8 and I9 communicating with the intake members l6 and I1 respectively, and the intake ports I8 and I9 communicate with a vertically disposed bore 20 which is formed in the housing IS.

A vertically slidable valve plug 2i engages in the bore 20 and is preferably of hollow construction, being formed with a longitudinal bore 22. The plug 2! is formed with a peripheral groove 23 and is also formed with a plurality of openings 24 communicating the groove 23 with the bore 22. The housing i5 is formed with annular grooves 2m and 22a communicating with ports l8 and [9 respectively, so that the intake pressures will be evenly distributed entirely around plug 2|.

The bore or guide 20 at its lower end communicates with a passage 25 which is disposed below a regulating chamber 26. The bottom Wall 21 of the chamber '26 is formed with a depending valve seat 28 and a diaphragm valve generally designated as 29 is adapted to engage against the seat 28 so as to cut off flow of fluid from thepassage'25 to the chamber 26.

The diaphragm valve member 29 includes a resilient disc-shaped member 30 which engages on a seat 3| formed in a lower head or plate 32. The resilient member 30 is formed at the central portion thereof with an enlarged heador valve member 33 within which a disc or weight member 34 is embedded.

The reinforcing member 34 also includes an upwardly projecting stud orstem 36 having a head 37 projecting above the top of'the valve member 33 and extending into the interior of the valve or seat member 28. l- Arpilottvalve member38is disposed below the lower endlof the valve plug 21 and is' adapted when inclosed position-to engage on'aseat 39 carried by the head-or plate 32. The head or plate-.32 includes a passageo lll. extending below the valve seat 39 and comprising a bypass passage which-communicates with the regulating chamber 25. A pressure passage 4| is also-formed in the head or plate-32, extending from arpoint above the valve seat:39-and: communicating with the lower chamber v35.

A guide bushing 42 is carried by the head or plate 32 and the .pilot valve member 38 loosely engages through thebushing 42. There isa substantial space 53 between the pilot valve member 38' and the-bore of the bushing 42 so. that pressure from the bore 25 will be communicated .tothe-passagedl and-the chamber 35.

The pilot valve member 38 is carried by an elongated stem --44 which-extendsloosely andcentrally. through the valve plug 2|, and the upper end of the stem M has secured thereto a disc shaped-guide or slide member 45 formed with at. least one slot ifiextending inwardly from theperiphery-thereof. Ari-electric operator generally designated s 41 is carried by the housing l and includes a solenoid'coil 48 disposed about a. tubular guide. 49 vwhichis fixed at.its lower end. in a nut-59 adapted to .be threaded into thehousing' l5.

. The .disc or guide 45 for the pilot valve slidably engages within the tubular member 49. The solenoid 4! includesa movable core- 55 which is of tubular construction and is adapted when in inoperative positiontoengage on a shoulder 52 which is formed in the housing I5. The core 5| engages the lower side..of anannular rib or fiange53 which is carried by the upper end portion of the valve plug 2l-so that upward movement of the core. 5| will pull the valve plug 2| upwardly to mixing position.

A spring 54 is interposed between the rib or flange 53 and the head or plate 45 carried by the pilot-valve stem'44 so that upon. upward movement of the valve plug 2! the pilot valve 38 will, when the spring 54 has been tensioned to a predetermined degree, move-the pilot valve member 35 to. open position. The spring 54 also constitutes a balancing means which is adapted to provide a resilient force acting against the magnetic pull of the core 5| and maintaining the valve plug 2| in a predetermined mixing position and normally is spaced at its upper end from plate 45. Each intakemember l6 and i! has disposed therein a screen or strainer 55 which is carried .a plurality of thermostatic switch members 60,

there. being three such thermostatic members shown in Figure 4. The thermostatic switch members 60 are of conventional construction and are. adapted to regulate the closing of the electric circuit to'the solenoid coil 48 in accordance with vformed with a central bore 72.

the temperature of fluid passing through the chamber 26.

. .Referring now to Figure 8, there is disclosed a modified form of this invention, the modification of this inventionbeing betweenthe main valve plug and the pilotvalve and the solenoid core. The valve housing I5a which is constructed similar tothe'valve housingl5, isformed witha bore 25a for the main valve plug BI and valve plug 5! has-'flxed-therein a pilot valve stem 62. The pilot valveistemtz is'formed with a reduced diameter lower-portion. 63 about which a sleeve valve memberM is disposed. The sleeve valve member 64 is fixed to the lower stem member 53 .bymeans of apin 65 which-extends through the lower stem member 63. The sleeve member 64 isspaced. downwardly from the valve plug member 5! so that when the device is in inoperative position the sleeve member 54 will be disposed below-thecold fluidrintake port [8a and will be disposed in-closed'position with respect to the hot fluid intake port l'9a. The housing 15a is formedcwith annular. grooves 18b and 192) communicating withports l8a and. 19a respectively, so =astoequalize the. intake pressures around plugtl and sleeve 64.

.The. housing i 5a has. extending upwardly therefrom. an electricoperator lla which includes a tubular. solenoid. core Ella-engaging about the .valve plug 61.. The valve plug 5! is formed with an annular rib 53a which is normally positioned above v.a..shoulder- 55..formed on the interior of thecore-fila. In this manner'there will be a .lo st=motionbetween the core 5la and. the plug Ill during :theinitiaL-upward movement of the core 5|a.

Aspringfil engages about the upper end of the plug fil and the spring 5! at its upper one bears against a plug .58 which is fixed to the head 69 of the solenoid member 47a. Spring 5"! is adapted. to constantly urge valve plug 55 and pilot valve 52-63 downwardly, with the latter in closedposition and engaging on a pilot valve seat 39a. In other respects the construction shown in Figure 8 is similar to that embodied in Figures 1 to. 7. inclusive.

Referring now to Figure 9, there is disclosed a modified form of valve plug and pilot valve construction. A main valve plug 70 is formed with aperipheral groove or-channel H and is also A plurality of openings I3'communicate the groove ll with the bore 12. Theupper end of the main valve plug 10 :is formed with an annular rib it which is adapted to be engaged by the lower portion of a .solenoid'core which is formed with a shoulder 16 bearing against the lower side of the rib '54. A pilot valve stem 1! is disposed loosely within the bore -t'l2 and'stem H has. fixed to the upper end thereof an enlarged head I8 which loosely i engages in the interior of the hollow core I5.

Core I5 and head I8 are formed with slits 15a and 18a, respectively, to reduce or break up eddy currents. A spring I9 engages against the upper end of the head 18 and is adapted to engage against the upper end of the solenoid construction after the manner shown in Figure 8.-

Referring now to Figure 11, there is disclosed a further modification of this invention wherein the main valve plug 80 which is formed with a longitudinal bore 8|, has a pilot valve stem 82 l loosely engaging through the bore 8 I. A bushing 88 is carried by the upper end of the plug 80 and provides a guide for the valve stem 82. The plug 80 is formed with an annular rib- 84 which is adapted to engage against a shoulder 85 formed on the lower end of a solenoid core 86. The upper end of the pilot valve stem 82 has fixed thereto a plate or head 87 formed with a slot 88, and a spring 89 is interposed between the head or, plate 81 and the upper end of the plug 80.

Referring now to Figure 12, there are disclosed the electric circuits associated with this invention. The solenoid coil 48 is connected at one end by means of a conductor 90 to the movable 96 to one of the thermostatic switch members 6011, whereas contact 94 is connected by means of a conductor 91 to a second thermostatic switch member 60b. Contact 95 is connected by means of a conductor 98 to the third thermostaticswitch member 600. Thermostatic switch member 69a is connected by means of a conductor 99 to a conductor I00 which is connected to one side of the electric current supply.

The conductor I00 is a common conductor for one side of each of the thermostatic switch members and switch member 69b is connected to conductor I00 by conductor I0 I, whereas switch member 600 is connected to conductor I00 by means of conductor -I 02. v

A resistor I03 is connected between conductors 90 and I00 and provides a modulating means for supplying reduced current to solenoid 48 when any one of the thermostatic switch members has been moved to circuit breaking position, with time switch arm 9| engaging a predetermined one of the contacts 93, 94 or 9-5.

A switch I04 is interposed in the conductor I05 which is connected to the opposite side of the solenoid coil 48, and conductor I05 is connected to the opposite side of the current supply.

Switch member I04 includes a movable switch arm I06 which is operatively connected with switch arm 9| by means of a coupling or connecting member I01. Switch member I04 includes contacts I08, I09, and H0 which are connected to conductor I05 and are correlated with contacts 93, 94 and 95 respectively. In other words, when switch arm 9| is engaged with contact 93, switch arm I06 is engaged with contact I08. When switch arm 9| is moved to circuit breaking position switch arm I06 is also moved to circuit breaking position so that solenoid 48 will be clisconnected from the supply source and will not be operative by the shunted or reduced current passing from conductor I00 through resistance 103, to conductor 90.

A float operated switch III is interposed in ventional construction, which is adapted to be disposed in operative relation with respect to the receiver, such as the washing machine or the like, in order that the operation of the mixing valve structure may be regulated in accordance with the level of water or fluid within the receiver.

In the use and operation of this invention, and referring first to Figures 1 to 7, and to Figure 12,

' assuming that water of a temperature of 145 is desired in thereceiver, switch arm 9| is moved to engagement with contact 93. Inasmuch as the temperature of the fluid in chamber 26 is initially less than 145, thermostatic switch 60a will be in closed position, closing circuit from conductor I09 through thermostatic switch 60a, contact 93, and switch arm 9|, to conductor 90. When switch arm 9| engages contact 93, circuit I05 is also closed in switch I04 by switch arm I06 engaging contact I00. At this time solenoid core 5| will be moved upwardly, moving therewith main valve plug 2| to a position where the lower end of plug 2| will uncover the hot fluid port I9.

, Upward movement of plug 2| will compress spring 54 and will also move pilot valve 38 to open position with respect to valve seat 39. When pilot .valve 08 is in open position, fluid pressure in chamber will be released through bypass passages IIv and 40 to chamber 26, and the pressure in chamber 25 being greater than the pressure in chamber 35 will move valve member 33 to open position so that tempered fluid may flow from bore 20 through passage 25 and valve seat 28 into chamber 26. Whenv the mixed fluid in chamber 26 has a temperature equal to or above 145, thermostatic switch member a will move to circuit breaking position and in the event that r the amount of fluid discharged into the receiver ing or shunting of electric current through resistance I03.

Whensolenoid 48 is energized by a reduced current passing through resistance I03, core 5| will be moved downwardly by spring 54 and main valve plug 2Iwill be lowered by spring 54 to a position at least partially covering the hot fluid port I9. At this time the pilot valve 98 will be disposed in open position so that main valve 33 will also be disposed in open position.

The valve structures shown in Figures 8 to 11 respectively will operate in substantially the same manner as that for Figures 1 to 7 inclusive.

In Figure 13 there is disclosed a modified form of electric circuit for the operator. The solenoid coil 48b is connected at one end by means of conductor I05b to one side of a supply source and a manual switch H3 is interposed in conductor I052). The other end, of coil 48b is connected by conductor 90b to a common conductor II4 connecting the thermostatic switches 68d and 90c together.

conductor I00 and is moved to circuit making or Switch 6011 is connected by conductor I02b to timer 92b and switch 60a is connected by conductor 9% to timer 92b. A shunt conductor I I5 is connected between timer 92b and a tap I I6 in coil 481), so that enough energy will be fed to coil 48b when either switch 60d or switch 606 is connected with timer 92b for the purpose of holding valve plug 63 against closing.

In Figure 14 there is disclosed a pressure reducing outlet adapted for use with each of the valve structures herein disclosed. The outlet 1 member 6Ia includes a boss I I6 having a threaded bushing III and a nipple II8 formed with a bore 7 'I l9 and a 'counterbore I20. The boss I I6 is formed with a bore I 2"! withinwhicha'triangular' valve I22 is loosely mounted. Valve I22-bears at its outer side against the inner end ofspring I23 which is seated in counterbore-IZB Bores I26 and I2I form a shoulder or seat '-I 24' toward which but if outlet pressure increases valve'member will move toward seat I24 and willproportionately restrict the outlet port so that the rate of flow of the discharged fluid will always be within apredetermined range.

I do-not mean to confine myself to the exact details of construction herein disclosed, but claim all variations falling within the purview of the prising 'ahousing having a mixing chamber and a pair of intakeports, saidhousing having an intermediate passage '"communicating said intake ports with said chamber, a valve seat in said pas-' passage, a resilient'pressure operated valve memvalve member I22 is adapted to mov'e under pres- I sure of the discharging fluid; Where the fluid pressure is normal spring I23 will hold valve member I22 a substantialdistance from seat I24,

ber engageable on said seat, said valve member including a-rigid discmember fixed thereto whereby to hold saidvalvemember against distortion, -a valve' plug intersecting said intake ports and slidably carried by saidhousing, said plugbeing so formed and arranged that fiui --pressure from one-of said ports will be constantly disposed on atleast a portion' of one side of said valve member-tending to move said valve member to open position, an electric operator for said plug, said housing having a by-pass passage, a resilient pressure operated valve member engageable on said seat,"a valve plugintersecting said intake ports andslidablyparried "by said housing, said plug beingso formed andarranged that fluid pressure from one of saidports will be constantly disposed on at least aporti'on of one side of said valve member tendin'g'to' move said valve member to'open'position, an electric operator for said plug, said housing havinga bypass passage communicating said first named" passage with said chamben-a" pilot valve seat in said second passage, a pilot valve, an operative connection between 'saidpilot valve and said plug, there being a pressure communicating passage between said first named passageand the, oppopass passage communicatin said" firstnamedsite side of said valvev member, and thermostatic means in said chamber connected with said operator for controllingv operation of said operator in accordance'with the temperature of? fluid in said chamber.

2. A temperature controlled mixing valve comsage communicating said first named passage with said chamber, a pilot "valve seat in said second-passage, a pilot valve, an operative connection between said pilot valve and said plus, there being'a-pressure communicating passage between said first-named passage and the opposite side of said'valve member, and thermostatic means in said chamber connected with said operator-i01- controlling operation of said operator in accordance with the temperature of fluid in said chamber.

- 4. A temperature controlled mixing valve comprising a-housing having a mixing chamber and a pair'of intake ports, said housing having an intermediate passage communicating said intake ports with said-chamber, a valve seat in said passage, a resilient pressure operated valve mem- --ber-engageab1e on said seat, said-valve member including a disc embedded in the central portion thereof-whereby to reinforce the central portion of said valve member and hold the latter against distorting by pressure from either side thereof, a valve plug intersecting said intake ports and slidably carried by said'housing, said plug being so formed andarranged that fluid pressure from one'of said ports will becon- 'stantly disposed on atleast a portion of one connection between said pilot valve" and said side of said valve member tending to move said valve member toopen'positionyan electric op erator for said plug, said housing having'a bypassage with said'chamber, ajpilotvalve seat in said second passage, 'a'pilot valve; an operative connection between said pilot valve and said plug,

' there being a pressure communicating'pa'ssage means in said chamber connected with said operator for controlling operation of said opera tor in accordance with the temperaturepffiuid in said chamber, saicloperative connection be' tween said plug and pilot valvebein so constructed and arrangedas to provide "a--te'nsion- 'able balancing iorce between said" plug and said operator upon movement of-said plugto'-fiuid mixing position.

side of said valve member tending to-move said valve 'membert0"open position; an electric operator'for said plug; said housing having a bypass passage communicating said first named passage with said-chamber, apilot valve seat in said second passage, a pi1ot'-valve,-an operative plug, said housinghaving a pressure communicating passage connecting said first named passage with' the opposite side of said valve member, and thermostatic means in said chamber connected with said operator for controllin operation of said operator'inaccordance with the temperature of fluid in said chamber.

5. A temperature controlled mixing valvecom- *prisingahousing having a mixing chamber and a pairof intake ports; said housing having an intermediate passage "communicating said intake "ports" with said chamber, a'valve seatin said passage, a--diaphragm valvemember-including a centrally-disposedhead-engageable on said seat, a valve plug intersecting said intake ports andslidably carried'bysaid housing, said plug being so formed and' arranged that fluid pressure-from one of said ports will'be constantly disposed onatleasta portion of .one side of said valve "member tending tothereby -move 1 said valve member to open position,an electric operator for saidplug, said" housing having a-by-pass -passage-' communicating said first named passage -with-said chamben' apilot-waive seat in said t '9 second passage,- a pilot valve engageable on said latter seatya spring interposed between said plug and said pilot valve, said spring being'tensioned upon upward movement .of said plug to mixing position, tensioning of said spring also efiectin-g movement of said pilot valve to open position, there being a pressure communicating passage between said first named passage and the opposite side of said valve member, and thermostatic switch means in said chamber connected with said operator for controlling operation of said operator in accordance with the temperature of fluid in said chamber, movement of said pilot valve to closed position effecting a pressure differential on opposite sides of said valve member whereby'said valve member will be moved to'closed position by pressure thereon communicated to said valve member through said second passage.

' 6. A temperaturecontrolled mixing valve comprising a housing having a mixing chamber and a pair of intake ports, inwardly opening check 7 valves in each of said ports, said housing havvalve member tending to thereby move said valve member to open position, an'electric operator for said plug, said housing having a by-pass passage communicating said first named passage with said chamber, a pilot valve seatin said second passage, a pilot valve engageable on said latter seat, a spring interposed between said plug and said pilot valve, said spring being tensioned upon upward movement of said plug to mixing position, tensioning of said spring also efiecting movement of said pilot valve to open position, there being a pressurecommunicating passage between said first named passage and the opposite side of said valve member, and thermostatic switch means in said chamber connected with said operator for controlling operation of said operator in accordanoe with the temperature of fluid in said chamber, movement of 'said'pilot valve to closed position effecting a pressure differential on opposite sides of said valve memberwhereby said valve member will be moved to closed position by pressure thereon communicated to said valve member through said second passage.

7. A temperature controlled mixing valve comprising a housing having a mixing chamber and a pair of intake ports, said housing having an intermediate passage communicating said intake ports with said chamber, a valve seat in said passage, a resilient pressure operated valve member engageable on said seat, a valve plug intersecting said intake ports and slidably carried by said housing, said plug being so formed and arranged that fluid pressure from one of said ports will be constantly disposed on at least a portion of one side of said valve member tending to move said valve member to open position, an electric operator for said plug, said housing having a by-pass passage communicating said first named passage with said chamber, a pilot valve seat in said second passage, a pilot valve fixed relative to and extending below said plug, there being a pressure communicating passage between said first named passage and the opposite side of said valve member, and thermostatic means in termediate passage communicating said intake ports with said chamber, a valve seat in said passage, a resilient pressure operated valve member engageable on said seat, a valve plug'intersecting said intake ports and slidablycarried by said housing, said plug being so formed and arranged that fluid pressure from one of said ports will be constantly disposed on at least a portion of one side of said valve member tending to move said valve member to open position, an electric operator for said plug, a lost motion connection between said operator and said plug, said housing having a by-pass passage communicating said first named passage with said chamber, a pilot valve seat in said second passage, a pilot valve, an'operative connection between said pilot valveand said plug, there being a pressure communicatingpassage between said first named passage and the opposite side of said valve mem ber, ,and thermostatic means in said chamber connected with said operator for controlling operation'oi said operator in accordance with the temperature of fluid in said chamber.

9. A temperature controlled mixing valve comprising a housing having a mixing chamber and a pair of intake ports, said housing having an intermediate passage communicating said intake ports with said chamber, a valve seat in said passage, a resilient pressure operated valve me i-- ber engageable on said seat, a valve Plug intersecting said intake ports and slidably carried by said housing, said plug being so formed and ar ranged that fluid pressure from one of said ports will be constantly disposed on at least a portion of one side of said valve member tending to move said valve member to open position, an electric operator for said plug, said housing having a bypass passage communicating said first named passage with said chamber, a pilot valve seat in said second passage, a pilot valve, an operative connection between said pilot valve and said plug, there being a pressure communicating passage between said first named passage and the opposite side of said valve member, and thermostatic means connected with said operator for controlling operation of said operator in accordance with the temperature of fluid discharged from said housing.

10. A temperature controlled mixing valve comprising a housing having a mixing chamber and a pair of intake ports, said housing having an intermediate passage communicating said intake ports with said chamber, a valve seat in said passage, a resilient pressure operated valve member engageable on said seat, a valve plug intersecting said intake ports and slidably carried by said housing, said plug being so formed and arranged that fluid pressure from one of said ports will be constantly disposed on at least a portion of one side of said valve member tending to move said valve member to open position, an electric operator for said plug, said housing having a by-pass passage communicating said first named passage with said chamber, a pilot valve seat in said second passage, a pilot valve, an operative connection between said pilot valve and said plug, there being a pressure communicating passage between 'compri'sing a hdusi'ng 'and'a pair-oi intake-ports; said lio usi'n'g hav-ing joharged fi om said housing. an intermediatesassa e oir'miuiiicating-- said intake' ports with said chamber, 'a valve' seat in said passa e, a resilient pressure-operated-valv mmber eng-a eable mi said seat, a; :vawe pmg interseating 'saiddntake ports and .s'lidably (Ear fl 35345fil'bfh g-:pat n said hc'i'uising;said plug -bingiso fdrined andarranged tfiatfiiIid preSSUr' frOm One of said'pbrts 'wiil b'e constantly dis' 3osed"'0'ii at'leas't 'a po'rtion of on'e'side of said' valve' member tendirig tciinove said'va1Ve= iiieir'1bei'-' to ciijeh'Iidsition; an eleotriq operator 'foi sai'd pl'ug, 'a lbs ifiation -conn'ection -btweeii Said pe'iator and said plug, said Housing mea s ssage and the-oppos'ite sideof i-12 5 having azkby pass passage cemmu-nisating -said first-named passagew'ith said chamber, a---pi1ot valve 1 seat in' said second' passage a pilot va'lve, amoperative"connection between: said i pilotvalve perature of fluid discharged from said housing; s and'said plug; there being apressure' comm-unisai'd operative 60nneotion betxveemsaid plug and i pi1ot -va1ve being so constructed and arranged i as to pr'ovide a tensionable ba'l'ancin g::foroe between 5 -said plug and said-operator?upon movement of I said: plug to fifiid mixing p'o'sition.

- 11;- A temperature 'controlledmixing; valve c'om- 'j'rising-a' housing having amixing chamber and a pair 0 1: intake: ports; s'aid housing having an intermediat 'pas'sage I c'omiriiinioating said' intake p'orts- 'With s'aid haniber; a va1ve" 'seat" in: said resilient pressure-operated"valve memfbei 'ngageableon said sea-t; saidvalve member" incl-udinga rigi'd dise member fixedtheretb'whereby to holdsaid valy member"agaihst distoi tion; a Valve plug-intersecting "said intake p0rtarids1ida 2 sriember eIig'ageaMebn said seat}- a:v'a1ve"p1ug T 'ab1y ar-ried "by' 's'aid'- housing," said pl'ug' beingso formed and arranged tiiat fluidpressure -from oneof said porfis wilkbe nstaritly disbosed on at least a pbr tioi-i of line-side of 'said 'valve member teiidiiig t fmov e said -valve member to' openp'osi;; tion 0fi one side'of -said valve member'tending to tion; a'n-eleo'tric operator: fo'rsaid plugi 's'aid housin having a'by-pass passag e communicating said first named passag' with 'said ohainbei a-qsiilot valve 'seat iii "said se'cdnd passage; a pilot valve, ---'anoperative;ooiineotion btweensaid pfldt 'valve and said piugg there' being a 'pies'siir oinmiinieating- "pass'age betweensaid rst named passage and the 1 opposite: side of saidvalve member, and tl'i'riiiostatic' means connected with said-' opv eating -passagefibetween said first'mamed passage and-the: opposite side of said valve member; thermostati'c meansin said chamber connected with 1! said: operator-for controlling-Z operation of said 5610-1 operator in accordance-with the-' -temp'eratureof 15 comprising ai'h'ousing having a mi-xing chamber and a pair of intakeportsgsaid housing having an-intermediate passagecommun'icating said -"intake ports witlzcsaid chamber, a"va1ve*seat in said passage, a resilient pressurexoperatedvalve intersecting said intake ports and: slidably caried by -sa'idhousing g said plug being so formed nd-arranged thatifiuid pressure from oneof said aortswill be'constantlydisposed on at :le'asta porald-housingihaving aiby-vpass passage communiatins s'ai firstnamed passage withsaid chamberfi, a pilot valve seat in saidsecond passage,- a

' ilot -valveg an"operative connection between said ilot valv'e and: saidplug 'there being a p'ressure eia'tor for centro 1iing operation 0f said enemas-3 51 communioating passage between Said fiISt -1'i&md

I tor in accordance -with the tem erature of' fiilid discharged rem said 1 housing. 1 12. At'enifier'ature T1 controlled -riiixing valve vin'g s mming chamber apass'age'and the Opposite side of said valve-memerg andsthermostatic means coimected with said A perator for controlling operatio'n of said operator min aticordainceiiwitlivthe t'emperature of" fluid dis- IT E D ST'A'I'ES PA'I'ENTS 

